[demo] some minor improvements

Summary: Ended up presenting this version at F8.

Reviewed By: jeremydubreil

Differential Revision: D15189643

fbshipit-source-id: 332b7c0da

examples/demo/02/Resources.java

@@ -12,15 +12,15 @@ import java.io.IOException;
 class Resources {
 
   public static void cat() throws IOException {
-    FileInputStream fis = null;
-    FileOutputStream fos = null;
+    FileInputStream infile = null;
+    FileOutputStream outfile = null;
     try {
-      fis = new FileInputStream(new File("infile.txt"));
-      fos = new FileOutputStream(new File("outfile.txt"));
-      fos.write(fis.read());
+      infile = new FileInputStream(new File("infile.txt"));
+      outfile = new FileOutputStream(new File("outfile.txt"));
+      outfile.write(infile.read());
     } finally {
-      if (fis != null) fis.close();
-      if (fos != null) fos.close();
+      if (infile != null) infile.close();
+      if (outfile != null) outfile.close();
     }
   }
 }

examples/demo/02/ResourcesFixed.java

@@ -12,9 +12,9 @@ import java.io.IOException;
 public class ResourcesFixed {
 
   public static void cat() throws IOException {
-    try (FileInputStream fis = new FileInputStream(new File("infile.txt"));
-        FileOutputStream fos = new FileOutputStream(new File("outfile.txt")); ) {
-      fos.write(fis.read());
+    try (FileInputStream infile = new FileInputStream(new File("infile.txt"));
+        FileOutputStream outfile = new FileOutputStream(new File("outfile.txt")); ) {
+      outfile.write(infile.read());
     }
   }
 }

examples/demo/03/Client.java

@@ -4,7 +4,6 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  */
-@ThreadSafe
 public class Client {
 
   Account account;

examples/demo/Makefile

@@ -3,12 +3,14 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
-SUBDIRS = 00 01 02 03
+SUBDIRS = 00 01 02 03 03.fixed 04 04.fixed
 
 default: all
 
 clean:
 	$(foreach subdir,$(SUBDIRS),$(MAKE) -C $(subdir) clean;)
 	rm -fr $(foreach subdir,$(SUBDIRS),$(subdir)/infer-out/)
+	rm -fr infer-out/
 
-all: $(OBJECTS)
+all:
+	$(foreach subdir,$(SUBDIRS),$(MAKE) -C $(subdir) all;)